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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '064798f591d528103f61c36863c475b1a7db2eaa961dedefc7d9303c57d15b14' 
  AND token = 'FG/jWGt5tYXsecFc6DacQWPxigMdg/Lrhz0dT2S2bmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}